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DataGridView合并单元格(一列或一行)之一
#region"合并单元格的测试(一列或一行)" // int?是搜索一种类型(可空类型)，普通的int不能为null，而用int?，其值可以为null //private int? nextrow = null; //private int? nextcol = null; //在CellPainting方法后调用 private void dataGridView1_CellFormatting(object sender, System.Windows.Forms.DataGridViewCellFormattingEventArgs e) { /* //列标示 if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PARENTID" && e.RowIndex >= 0) { //若与下一行同列单元格值相同则修改设置 if (e.RowIndex < this.dataGridView1.RowCount - 1 && this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value != null) { if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString()) { e.CellStyle.BackColor = Color.LightPink; this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Style.BackColor = Color.LightPink; this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true; //this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].ReadOnly = true; } } } */ /* //行标示 if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PHONE1" && e.RowIndex >= 0) { //若与同行下一列单元格值相同则修改设置 if (e.ColumnIndex != this.dataGridView1.ColumnCount - 1 && this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value != null) { if (e.Value.ToString() == this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString()) { e.CellStyle.BackColor = Color.LightBlue; this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Style.BackColor = Color.LightPink; this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true; //this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].ReadOnly = true; } } } */ } //========================== //绘制单元格 private void dataGridView1_CellPainting(object sender, System.Windows.Forms.DataGridViewCellPaintingEventArgs e) { //纵向合并 if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PARENTID" && e.RowIndex >= 0) { using ( Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor), backColorBrush = new SolidBrush(e.CellStyle.BackColor)) { using (Pen gridLinePen = new Pen(gridBrush)) { // 擦除原单元格背景 e.Graphics.FillRectangle(backColorBrush, e.CellBounds); /****** 绘制单元格相互间隔的区分线条，datagridview自己会处理左侧和上边缘的线条，因此只需绘制下边框和和右边框 DataGridView控件绘制单元格时，不绘制左边框和上边框，共用左单元格的右边框，上一单元格的下边框*****/ //不是最后一行且单元格的值不为null if (e.RowIndex < this.dataGridView1.RowCount - 1 && this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value != null) { //若与下一单元格值不同 if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Value.ToString()) { //下边缘的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); //绘制值 if (e.Value != null) { e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font, Brushes.Crimson, e.CellBounds.X + 2, e.CellBounds.Y + 2, StringFormat.GenericDefault); } } //若与下一单元格值相同 else { //背景颜色 //e.CellStyle.BackColor = Color.LightPink; //仅在CellFormatting方法中可用 this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = Color.LightBlue; this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].Style.BackColor = Color.LightBlue; //只读（以免双击单元格时显示值） this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true; this.dataGridView1.Rows[e.RowIndex + 1].Cells[e.ColumnIndex].ReadOnly = true; } } //最后一行或单元格的值为null else { //下边缘的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); //绘制值 if (e.Value != null) { e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font, Brushes.Crimson, e.CellBounds.X + 2, e.CellBounds.Y + 2, StringFormat.GenericDefault); } } ////左侧的线（） //e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, // e.CellBounds.Top, e.CellBounds.Left, // e.CellBounds.Bottom - 1); //右侧的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); //设置处理事件完成（关键点），只有设置为ture,才能显示出想要的结果。 e.Handled = true; } } } //横向合并 if (e.ColumnIndex >= 0 && this.dataGridView1.Columns[e.ColumnIndex].HeaderText == "PHONE1" && e.RowIndex >= 0) { using ( Brush gridBrush = new SolidBrush(this.dataGridView1.GridColor), backColorBrush = new SolidBrush(e.CellStyle.BackColor)) { using (Pen gridLinePen = new Pen(gridBrush)) { // 擦除原单元格背景 e.Graphics.FillRectangle(backColorBrush, e.CellBounds); /****** 绘制单元格相互间隔的区分线条，datagridview自己会处理左侧和上边缘的线条，因此只需绘制下边框和和右边框 DataGridView控件绘制单元格时，不绘制左边框和上边框，共用左单元格的右边框，上一单元格的下边框*****/ //不是最后一列且单元格的值不为null if (e.ColumnIndex < this.dataGridView1.ColumnCount - 1 && this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value != null) { if (e.Value.ToString() != this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Value.ToString()) { //右侧的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); //绘制值 if (e.Value != null) { e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font, Brushes.Crimson, e.CellBounds.X + 2, e.CellBounds.Y + 2, StringFormat.GenericDefault); } } //若与下一单元格值相同 else { //背景颜色 //e.CellStyle.BackColor = Color.LightPink; //仅在CellFormatting方法中可用 this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = Color.LightPink; this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].Style.BackColor = Color.LightPink; //只读（以免双击单元格时显示值） this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true; this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex + 1].ReadOnly = true; } } else { //右侧的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right - 1, e.CellBounds.Top, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); //绘制值 if (e.Value != null) { e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font, Brushes.Crimson, e.CellBounds.X + 2, e.CellBounds.Y + 2, StringFormat.GenericDefault); } } //下边缘的线 e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom - 1, e.CellBounds.Right - 1, e.CellBounds.Bottom - 1); e.Handled = true; } } } } #endregion
DataGridView合并单元格(一列或一行)之一
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